donald trump is unveiling his "very big" announcement regarding president obama. john harwood is in washington. he has the details. what's he got, john. >> sue, yesterday donald trump was on our air saying he would have a major announcement about the race. it wasn't major at all, turned out just to be another publicity stunt by donald trump appealing to the crackpot fringe of american politics that raises questions about barack obama's americanness. he offers $5 million for the publication of barack obama's passport application records, his college records, he also continued to raise questions about the president's birth certificate which of course has been released. so nothing for anyone to actually pay attention about. the obama campaign said direct your questions to the romney campaign since donald trump works for romney. the romney campaign doesn't want to have anything to do with this either, guys. >> john harwood, thank you very much. >>> shares of facebook seeing their largest one-day gain since its ipo in may after gaining gains in the key mobile advertisi